Arc-lamp system



T. J. MURPHY.

ARC LAMP SYSTEM.

APPLICATION FILED JAN. I2. 1917.

1,350,170, Patnted Aug. 17,1920

UNITED sures-1 PATENT omen.

' mourns .r. MURPHY, or nocnnsrn'n, new YORK,- mama-or ONE-HALF 'ro AMES L P. B. DUFFY OI "ROCHESTER, NEW YORK.

LAM-LAMP SYSTEM.

certain new and useful Arc-Lamp Systems;

and I do hereby declare the following to be a full, clear, and, exact description of the invention, such as will enable others skilled in the art to which it appertains to .make' and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates to are lamp systems. It particularly has for its object to provide a system for starting arcsin lamps having tungsten terminals located in a neutral gas at practically atmospheric pressure.

The invention may be contained in different arrangements of systems, all of which come within the purview of my claims hereinafter appended. To show the practicav .bility of my invention I have selected one of such systems-as an example and shall describe it hereinafter. The system selected is.

illustratedin the accompanying drawing.

The drawing illustrates a tungsten lamp and. a system for controlling and operating the same. 1 is the lamp, which is provided with two balls 2 which are disposed in proximity to each other but are removed from each other sufiicient to produce the desired are between them. They are supported by wires or filaments'3 within the bulb 1. The bulb 4 is filled with an inert gas, such as nitrogen or argon. Y

The lamp 1 is connected with a system for starting the arc and controlling the flow of the current to and through the lamp when once the arc is started. The lamp isoperated by an alternating current, the source of which is connected to the lines 5, 6. One terminal 2 of the lamp is connectedthrough the inductance device 8, while the other terminal 2 of the lamp is connected to a means 'for starting the arc of the lamp as well as through the inductance device 8 and t0 the line 5.

' A resistance 10 is. connected to the line 6 and to a switch 11 which may be operated in one direction by means of a spring '12 to open the circuit from the line 6 through the resistance 19. The resistance 19 operates to Specification of Letters Patent.

Patented Aug. 17; 1920.

J Application filed January '12, 1917. Serial No. 141,990.

'prevent.a too great current flow when the switch 11 is closed. The switch contact 13 is connected to the primary 14:, which in turn is connected to the resistance 15. The

circuit of the resistance 10, primary 14 and res1stance 15 is'completed by aswitch 16 when the switch arm is in contact with the fixed contact'17 to which the resistance 15 is and the currentpasses through the resistance 10, the switch 11 and part of the primary coil 14, to the line 5. This produces a .high' potential current in the secondary 20,

which is connected to thecondenser 21 through the induction devices 22. The dis charge of the condenser is through the lamp 1, the terminals 2 being connected with the terminals of the condenser. The discharge across the terminals 2 is regulated by the adjustable terminals 23. At the same time that the switch 11 is' closed to the contact 13, the switch 16 is closed to the contact 17 and when a spark is formed across the terminals an arc is established by the current which passes from the line 6 through the inductance device 8 to the lamp 1, theme through the inductance device 8 to the switch 16 and the resistance15, and a part ofthe primary 14 to the line 5, which causes the current to flow through the arc, which current has a potential higher than that of the main lines 5 and 6 by reason of the operation-of the booster coil or auto transformer 14. The

current having the higher potential is .allowed to flow until the terminals are suflicientlyheated or until the arc is well established, whereupon the switches 11 and 16 are allowed to move from the contacts 13 and 17 ,the switch 16 completing the circuit directly to the line 5. The current then continues to flow from the main line 6 through the inductance device to the lamp 1, thence through the inductance device 8 and switch -coil, means for connecting one terminal of the lamp with the other terminal of the coil and disconnecting the last named terminal the terminals of the lamp.

2. In a lamp lighting system, a source of current-supply havin a high electro-motive force, and a source 9 current supply having a lower electro-motive force, a lamp havmg electrodes connected to thesaid sources, a

third source of current su ply having an electro-motive force less t an the second 'named source, means for disconnecting the lamp from thefirst two named sources of current and connecting it .with the third named source.

3. In a lamp lighting system, a source of supply having a high electro-motive force, a lamp having electrodes connected to the source, means for causing a disruptive discharge of the current from the said source across the terminals of the lamp, a second source of current connected to the lamp and for disconnecting the lamp from the first 25 two named sources and connecting it with the third source.

4. In a lamp lighting system, a source of current supply havin a high electro-motive force and exceeding y small amperage, a 3 second source of current having a lower electro-motiveforce and larger current, a

lamp having electrodes connected to the said sources, a third source of current having an electro-motlve force lower than the second named source, means for disconnecting the lamp from the first named two sources and 7 connecting it with the last named source.

In testlmony whereof I have hereunto signed my name to this specification.

THOMAS J. MURPHY. 

